Manipulation of the means of exchange as a method of social control.
An indispensable primer for would-be monetary reformers who do not know the difference between interest and usury.
https://writing.upenn.edu/pennsound/x/Pound.php
http://media.sas.upenn.edu/pennsound/authors/Pound/1958/Pound-Ezra_10_Canto-XLV_DC_1958.mp3
Ezra Pound - June 1958 - Canto XLV (Usura)
@2:37 "contra Naturam!... "
@2:47 "...and so that you don't continually misunderstand, usury and interest are not the same thing: usury is a charge made for the use of money regardless of production, and often regardless even of the possibilities of production ..."